ADC0804 offset value? can it solve or????

[soohino]

i need some assistance here.
now im testing my ADC0804 and the output voltage is not the same with the input voltage i applied to it. there is some offset happened.
so now i think i might not getting the precise value for my project later. so what can i do for this?? anyone have any idea??

for my Vref, i use a resistor bridge to divide the voltage into 2.5V ( as my Vcc is 5V )

 

[Nigel Goodwin]

i need some assistance here.
now im testing my ADC0804 and the output voltage is not the same with the input voltage i applied to it. there is some offset happened.
so now i think i might not getting the precise value for my project later. so what can i do for this?? anyone have any idea??

What do you mean by 'output voltage'?.

An A2D provides a simple digital number based on the input voltage and the reference voltage - when the input voltage equals the reference voltage the value will be maximum, 255 for an 8 bit converter.

 

[williB]

i think soohino ment the value converted by the ADC ..?

 

[soohino]

yaya..
i use power supply to set my input voltage as XX.
then from the 8 LED, it shows the 8 bits. by refer to the LED bright, i check table n get the output voltage.
there are different@

 

[Nigel Goodwin]

yaya..
i use power supply to set my input voltage as XX.
then from the 8 LED, it shows the 8 bits. by refer to the LED bright, i check table n get the output voltage.
there are different@

Give some examples, as it is you're not giving us any information at all.